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Integration React React Router 6

PostHogOfficialCreated by PostHog

  • Skill
  • Tool integration
  • Software development
  • MIT
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From the author

PostHog integration for React Router v6 applications
— the description by PostHog

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a systematic workflow for developers to integrate PostHog into React Router v6 projects. It emphasizes best practices for client-side event tracking, user identification, and error handling while adhering to React-specific patterns. The guide includes a multi-step integration process, environment variable management, and strict guidelines on avoiding improper useEffect usage for event tracking.

What it does

  • Provides a step-by-step workflow for PostHog initialization in React Router v6.
  • Defines patterns for user identification during authentication flows.
  • Outlines best practices for event tracking and error capture.
  • Establishes guidelines for using PostHog feature flag hooks.
  • Demonstrates how to pass session and distinct IDs to backend services.
  • Includes reference examples for implementation patterns.

When to use it

  • When you need to add analytics to a new or existing React Router v6 application.
  • When you want to implement session replay or error tracking in a React project.
  • When you need to identify users and track specific business events.
  • When you are unsure about the correct placement of tracking logic within React components.

Advantages

  • Follows established React patterns to ensure code maintainability.
  • Prevents common pitfalls like overusing useEffect for event triggers.
  • Provides a clear, modular path for integration from setup to conclusion.
  • Ensures consistent user identification across frontend and backend boundaries.

Usage examples

“How do I initialize PostHog in my React Router v6 app?”
The agent will guide you through the main.jsx setup, including installing the provider and configuring the PostHog client with environment variables.
“Where should I place event tracking code for user actions?”
The agent will instruct you to place capture calls directly within event handlers rather than inside useEffect hooks.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/posthog/integration-react-react-router-6/download

  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip integration-react-react-router-6.zip -d .agents/skills

Documentation by PostHog

PostHog integration for React Router v6

This skill helps you add PostHog analytics to React Router v6 applications.

Workflow

Follow these steps in order to complete the integration:

  1. basic-integration-1.0-begin.md - PostHog Setup - Begin ← Start here

  2. basic-integration-1.1-edit.md - PostHog Setup - Edit

  3. basic-integration-1.2-revise.md - PostHog Setup - Revise

  4. basic-integration-1.3-conclude.md - PostHog Setup - Conclusion

Reference files

  • references/EXAMPLE.md - React Router v6 example project code

  • references/react-router-v6.md - React router v6 - docs

  • references/identify-users.md - Identify users - docs

  • references/basic-integration-1.0-begin.md - PostHog setup - begin

  • references/basic-integration-1.1-edit.md - PostHog setup - edit

  • references/basic-integration-1.2-revise.md - PostHog setup - revise

  • references/basic-integration-1.3-conclude.md - PostHog setup - conclusion

The example project shows the target implementation pattern. Consult the documentation for API details.

Key principles

  • Environment variables: Always use environment variables for PostHog keys. Never hardcode them.

  • Minimal changes: Add PostHog code alongside existing integrations. Don't replace or restructure existing code.

  • Match the example: Your implementation should follow the example project's patterns as closely as possible.

Framework guidelines

  • For feature flags, use useFeatureFlagEnabled() or useFeatureFlagPayload() hooks - they handle loading states and external sync automatically

  • Add analytics capture in event handlers where user actions occur, NOT in useEffect reacting to state changes

  • Do NOT use useEffect for data transformation - calculate derived values during render instead

  • Do NOT use useEffect to respond to user events - put that logic in the event handler itself

  • Do NOT use useEffect to chain state updates - calculate all related updates together in the event handler

  • Do NOT use useEffect to notify parent components - call the parent callback alongside setState in the event handler

  • To reset component state when a prop changes, pass the prop as the component's key instead of using useEffect

  • useEffect is ONLY for synchronizing with external systems (non-React widgets, browser APIs, network subscriptions)

Identifying users

Identify users during login and signup events. Refer to the example code and documentation for the correct identify pattern for this framework. If both frontend and backend code exist, pass the client-side session and distinct ID using X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers to maintain correlation.

Error tracking

Add PostHog error tracking to relevant files, particularly around critical user flows and API boundaries.

Files

references/EXAMPLE.md

PostHog React Router v6 Example Project

Repository: https://github.com/PostHog/context-mill Path: basics/react-react-router-6

README.md

PostHog React Router 6 example

This is a React Router 6 example demonstrating PostHog integration with product analytics, session replay, feature flags, and error tracking.

Features

  • Product Analytics: Track user events and behaviors

  • Session Replay: Record and replay user sessions

  • Error Tracking: Capture and track errors

  • User Authentication: Demo login system with PostHog user identification

  • Client-side Tracking: Examples of client-side tracking methods

Getting Started

1. Install Dependencies
npm install
# or
pnpm install
2. Configure Environment Variables

Create a .env file in the root directory:

VITE_PUBLIC_POSTHOG_PROJECT_TOKEN=your_posthog_project_token
VITE_PUBLIC_POSTHOG_HOST=https://us.i.posthog.com

Get your PostHog project token from your PostHog project settings.

3. Run the Development Server
npm run dev
# or
pnpm dev

Open http://localhost:5173 with your browser to see the app.

Project Structure

src/
├── components/
│   └── Header.jsx           # Navigation header with auth state
├── contexts/
│   └── AuthContext.jsx      # Authentication context with PostHog integration
├── routes/
│   ├── Root.jsx             # Root route component
│   ├── Home.jsx             # Home/Login page
│   ├── Burrito.jsx          # Demo feature page with event tracking
│   └── Profile.jsx            # User profile with error tracking demo
├── main.jsx                 # App entry point with PostHog initialization
└── globals.css              # Global styles

Key Integration Points

Client-side initialization (main.jsx)
import posthog from "posthog-js"
import { PostHogProvider } from "@posthog/react"

posthog.init(import.meta.env.VITE_PUBLIC_POSTHOG_PROJECT_TOKEN, {
  api_host: import.meta.env.VITE_PUBLIC_POSTHOG_HOST,
  defaults: '2026-01-30',
});

<PostHogProvider client={posthog}>
  <RouterProvider router={router} />
</PostHogProvider>
User identification (AuthContext.jsx)

The user is identified when the user logs in on the client-side.

posthog.identify(username);
posthog.capture('user_logged_in');

The session and distinct ID can be passed to the backend by including the X-POSTHOG-SESSION-ID and X-POSTHOG-DISTINCT-ID headers.

You should use these headers in the backend to identify events.

Important: do not identify users on the server-side.

Event tracking (Burrito.jsx)
posthog?.capture('burrito_considered', {
  total_considerations: updatedUser.burritoConsiderations,
  username: user.username,
});
Error tracking

Note: The app can be wrapped with PostHogErrorBoundary from @posthog/react (imported in main.jsx) to automatically capture unhandled React errors. Manual error capture can be added to components using posthog?.captureException(err).

Learn More

.env.example

VITE_PUBLIC_POSTHOG_PROJECT_TOKEN=
VITE_PUBLIC_POSTHOG_HOST=
PROJECT_ID=

index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>react-react-router-6</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/main.jsx"></script>
  </body>
</html>

src/components/Header.jsx

import { Link } from 'react-router-dom';
import { useAuth } from '../contexts/AuthContext';
import { usePostHog } from '@posthog/react';

export default function Header() {
  const { user, logout } = useAuth();
  const posthog = usePostHog();

  const handleLogout = () => {
    if (user) {
      posthog.capture('user_logged_out', {
        username: user.username,
        distinct_id: user.username,
      });
    }
    logout();
  };

  return (
    <header className="header">
      <div className="header-container">
        <nav>
          <Link to="/">Home</Link>
          {user && (
            <>
              <Link to="/burrito">Burrito Consideration</Link>
              <Link to="/profile">Profile</Link>
            </>
          )}
        </nav>
        <div className="user-section">
          {user ? (
            <>
              <span>Welcome, {user.username}!</span>
              <button onClick={handleLogout} className="btn-logout">
                Logout
              </button>
            </>
          ) : (
            <span>Not logged in</span>
          )}
        </div>
      </div>
    </header>
  );
}

src/contexts/AuthContext.jsx

import { createContext, useContext, useState } from 'react';

const AuthContext = createContext(undefined);

const users = new Map();

export function AuthProvider({ children }) {
  const [user, setUser] = useState(() => {
    if (typeof window === 'undefined') return null;

    const storedUsername = localStorage.getItem('currentUser');
    if (storedUsername) {
      const existingUser = users.get(storedUsername);
      if (existingUser) {
        return existingUser;
      }
    }
    return null;
  });

  const login = async (username, password) => {
    if (!username || !password) {
      return false;
    }

    let localUser = users.get(username);
    if (!localUser) {
      localUser = { 
        username, 
        burritoConsiderations: 0 
      };
      users.set(username, localUser);
    }

    setUser(localUser);
    localStorage.setItem('currentUser', username);
    
    return true;
  };

  const logout = () => {
    setUser(null);
    localStorage.removeItem('currentUser');
  };

  const setUserState = (newUser) => {
    setUser(newUser);
    users.set(newUser.username, newUser);
  };

  return (
    <AuthContext.Provider value={{ user, login, logout, setUser: setUserState }}>
      {children}
    </AuthContext.Provider>
  );
}

export function useAuth() {
  const context = useContext(AuthContext);
  if (context === undefined) {
    throw new Error('useAuth must be used within an AuthProvider');
  }
  return context;
}

src/main.jsx

import './globals.css'

import { StrictMode } from "react";
import ReactDOM from "react-dom/client";
import { BrowserRouter, Routes, Route } from "react-router-dom";
import Root from './routes/Root';
import Home from './routes/Home';
import Burrito from './routes/Burrito';
import Profile from './routes/Profile';

import posthog from 'posthog-js'; 
import { PostHogErrorBoundary, PostHogProvider } from '@posthog/react' 

// Initialize PostHog
posthog.init(import.meta.env.VITE_PUBLIC_POSTHOG_PROJECT_TOKEN, { 
  api_host: import.meta.env.VITE_PUBLIC_POSTHOG_HOST, 
  defaults: '2026-01-30', 
}); 

const root = document.getElementById("root");
if (!root) throw new Error("Root element not found");

ReactDOM.createRoot(root).render(
  <StrictMode>
    <PostHogProvider client={posthog}> 
    <PostHogErrorBoundary>
    <BrowserRouter>
      <Routes>
        <Route path="/" element={<Root />}>
          <Route index element={<Home />} />
          <Route path="burrito" element={<Burrito />} />
          <Route path="profile" element={<Profile />} />
        </Route>
      </Routes>
    </BrowserRouter>
    </PostHogErrorBoundary>
    </PostHogProvider>
  </StrictMode>,
);

src/routes/Burrito.jsx

import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import { useAuth } from '../contexts/AuthContext';
import { usePostHog } from '@posthog/react';

export default function BurritoPage() {
  const { user, setUser } = useAuth();
  const navigate = useNavigate();
  const [hasConsidered, setHasConsidered] = useState(false);
  const posthog = usePostHog()

  useEffect(() => {
    if (!user) {
      navigate('/');
    }
  }, [user, navigate]);

  if (!user) {
    return null;
  }

  const handleConsideration = () => {
    const updatedUser = {
      ...user,
      burritoConsiderations: user.burritoConsiderations + 1
    };
    setUser(updatedUser);
    setHasConsidered(true);
    setTimeout(() => setHasConsidered(false), 2000);
    posthog.capture('burrito_considered', {
      total_considerations: updatedUser.burritoConsiderations,
      username: user.username,
      distinct_id: user.username,
    });
  };

  return (
    <div className="container">
      <h1>Burrito consideration zone</h1>
      <p>Take a moment to truly consider the potential of burritos.</p>

      <div style={{ textAlign: 'center' }}>
        <button
          onClick={handleConsideration}
          className="btn-burrito"
        >
          I have considered the burrito potential
        </button>

        {hasConsidered && (
          <p className="success">
            Thank you for your consideration! Count: {user.burritoConsiderations}
          </p>
        )}
      </div>

      <div className="stats">
        <h3>Consideration stats</h3>
        <p>Total considerations: {user.burritoConsiderations}</p>
      </div>
    </div>
  );
}

src/routes/Home.jsx

import { useState } from 'react';
import { useAuth } from '../contexts/AuthContext';
import { usePostHog } from '@posthog/react';

export default function Home() {
  const { user, login } = useAuth();
  const posthog = usePostHog();
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');

  const handleSubmit = async (e) => {
    e.preventDefault();
    setError('');

    const success = await login(username, password);
    if (success) {
      posthog.capture('user_logged_in', {
        username: username,
        distinct_id: username,
      });
      setUsername('');
      setPassword('');
    } else {
      setError('Please provide both username and password');
    }
  };

  if (user) {
    return (
      <div className="container">
        <h1>Welcome back, {user.username}!</h1>
        <p>You are now logged in. Feel free to explore:</p>
        <ul>
          <li>Consider the potential of burritos</li>
          <li>View your profile and statistics</li>
        </ul>
      </div>
    );
  }

  return (
    <div className="container">
      <h1>Welcome to Burrito Consideration App</h1>
      <p>Please sign in to begin your burrito journey</p>

      <form onSubmit={handleSubmit} className="form">
        <div className="form-group">
          <label htmlFor="username">Username:</label>
          <input
            type="text"
            id="username"
            value={username}
            onChange={(e) => setUsername(e.target.value)}
            placeholder="Enter any username"
          />
        </div>

        <div className="form-group">
          <label htmlFor="password">Password:</label>
          <input
            type="password"
            id="password"
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            placeholder="Enter any password"
          />
        </div>

        {error && <p className="error">{error}</p>}

        <button type="submit" className="btn-primary">Sign In</button>
      </form>

      <p className="note">
        Note: This is a demo app. Use any username and password to sign in.
      </p>
    </div>
  );
}

src/routes/Profile.jsx

import { useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import { useAuth } from '../contexts/AuthContext';

export default function ProfilePage() {
  const { user } = useAuth();
  const navigate = useNavigate();

  useEffect(() => {
    if (!user) {
      navigate('/');
    }
  }, [user, navigate]);

  if (!user) {
    return null;
  }

  return (
    <div className="container">
      <h1>User Profile</h1>

      <div className="stats">
        <h2>Your Information</h2>
        <p><strong>Username:</strong> {user.username}</p>
        <p><strong>Burrito Considerations:</strong> {user.burritoConsiderations}</p>
      </div>

      <div style={{ marginTop: '2rem' }}>
        <h3>Your Burrito Journey</h3>
        {user.burritoConsiderations === 0 ? (
          <p>You haven&apos;t considered any burritos yet. Visit the Burrito Consideration page to start!</p>
        ) : user.burritoConsiderations === 1 ? (
          <p>You&apos;ve considered the burrito potential once. Keep going!</p>
        ) : user.burritoConsiderations < 5 ? (
          <p>You&apos;re getting the hang of burrito consideration!</p>
        ) : user.burritoConsiderations < 10 ? (
          <p>You&apos;re becoming a burrito consideration expert!</p>
        ) : (
          <p>You are a true burrito consideration master! 🌯</p>
        )}
      </div>
    </div>
  );
}

src/routes/Root.jsx

import { Outlet } from "react-router-dom";
import Header from "../components/Header";
import { AuthProvider } from "../contexts/AuthContext";

export default function Root() {
  return (
    <AuthProvider>
      <Header />
      <main>
        <Outlet />
      </main>
    </AuthProvider>
  );
}

vite.config.js

import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'

// https://vite.dev/config/
export default defineConfig({
  plugins: [react()],
})

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by
PostHog
Publisher
PostHog (Official)
Source
PostHog/skills · skills/posthog/integration/skills/react-react-router-6 · commit a5d30e7
Licence
MIT License (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced
Also distributed in
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Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download integration-react-react-router-6.zip